Cleaning Shower door with hard water marks?

I live in the country, have well water that is a little hard. I do have a water softener, but still get the white marks on my glass shower doors. What have you found to clean them and get the hard water off – oh ya they are also etched doors??

I also have a red rusty coating on my shower & tub walls what cleaners do you use to get this off?

Thanks for your time in replying.